Pros: Simple to use, clean interface, not a resource hog, free.
Cons: AVG TOOLBAR..
Other Thoughts: I always liked Gom Player, it was easy to setup and understand,the interface may look basic but click for options and there are plenty to keep you occupied.I haven't suffered playback problems, it plays pretty much everything i have thrown at it.
Recently i removed Gom Player from my machine due to the sneaky way the installer plants the AVG Toolbar. I was positive i unchecked the box so i removed Gom Player to try again. This time i didn't even get the option to uncheck the toolbar, it just installed it. I "hate" programs that install toolbars on the fly, enough to make me remove Gom Player altogether..